
WIRING
Wiring Low Voltage and Line
Voltage to a GRAFIK Eye
Control Unit
Overview
This application note explains the wiring rules in the 2002 National Electrical Code and Canadian
Electrical Code, Part 1 as they pertain to the connection of low voltage Class 2 conductors and line
voltage conductors to the GRAFIK Eye 3000 control units (this includes GRX-MR and GRX-IA units). It
is intended to clear up any questions which may exist with regard to these conductors occupying the
same device box.
Clarifications
GRAFIK Eye 3000 Control Unit
The back of a GRAFIK Eye 3000 control unit is diagramed below*. The different terminals have
been highlighted. The two- and three-zone GRAFIK Eye 3000 control units will differ in terminal
arrangement, but the terminals are identical aside from the number of zones. Sections A and B
below explain how the GRAFIK Eye 3000 control unit meets both the National Electrical Code
(NFPA 70) and the Canadian Electrical Code (CSA C22.1-02).
*
Model GRX-3106/3506 pictured.
APPLICATION NOTE
W17
P/N 048-060 rev. A
7/03
A. NFPA 70 – National Electrical Code (NEC)
The wallstation control link for the GRAFIK Eye 3000 control units is a Class 2 power-limited
circuit as described in Article 725 of the 2002 NEC®. Article 725.55 provides the specific rules
governing Class 2 conductors and line voltage conductors within the same box. These rules
state that Class 2 conductors and the line voltage conductors may occupy the same box as long
as they meet the following conditions:
1. The Class 2 and line voltage conductors must both enter the box to connect to the
equipment in that box.
2. All circuit conductors operate at 150 volts or less to ground and CL3, CL3R, CL3P, or
a permitted substitute cable is used to install the Class 2 circuit.
3. Class 2 conductors extending beyond the cable jacket are separated by a minimum
of 6 mm (0.25 in) from line voltage conductors.
The GRAFIK Eye 3000 control unit meets the first requirement since the Class 2 control circuit
originates in the GRAFIK Eye 3000 control unit. For the second requirement, in the GRAFIK Eye
3000 conductors will not operate over 120 V and Lutron cable GRX-CBL-346S-500 is properly
rated. If you are not using Lutron cable and unsure if it meets these requirements, contact your
cable manufacturer for information on CL3, CL3R, and CL3P cable.
As to the third requirement, Class 3 cable consists of insulated conductors inside a jacket; at the
point you connect the conductors to the GRAFIK Eye 3000 control unit you must strip back this
jacket, exposing the insulated conductors. GRAFIK Eye 3000 control unit units provide for the
minimum 6 mm (0.25 in.) separation of the Class 2 conductors from the line voltage conductors
through the positioning of the terminal block used to make the Class 2 connections to the
GRAFIK Eye 3000 control unit.
B. CSA C22.1-02 – Canadian Electrical Code, Part 1
The Canadian Electrical Code, 19th ed. (2002), provides the rules for wiring Class 2 circuits in
Article 16-200. Article 16-212 states the specific rules for separation of Class 2 circuits from
other circuits:
1. Like the NEC, the Class 2 and line voltage conductors must both enter the box to
connect to the equipment in that box.
2. All conductors must be insulated for the maximum voltage present on any conductor
in the box.
Again, the GRAFIK Eye 3000 control unit meets the first requirement since the Class 2 control
circuit and the line voltage wires connect to the GRAFIK Eye 3000 control unit. For the GRAFIK
Eye 3000 control unit, Lutron cable part number GRX-CBL-346S-500 meets the second
requirement since it is rated for 300 V and the maximum voltage on any conductor in these
applications will be limited to 120 V.
APPLICATION NOTE
W17
P/N 048-060 rev. A
7/03
Additional Information
World Headquarters
Lutron Electronics Co., Inc.
7200 Suter Road
Coopersburg, PA 18036-1299 U.S.A.
TOLL FREE: (800) 523-9466 (U.S.A., Canada,
and the Caribbean)
Tel: (610) 282-3800; International 1610 282-3800
Fax: (610) 282-3090; International 1610 282-3090
European Headquarters
Lutron EA LTD
Lutron House
6 Sovereign Close
Wapping
London, E1 9HW England
FREEPHONE: 0800 282107 (U.K.)
Tel: 44 (0)20-7702-0657
Fax: 44 (0)20-7480-6899
Hong Kong Office
Tel: 011 852-2104-7733
Fax: 011 852-2104-7633
Singapore Office
Tel: 011 65-6220-4666
Fax: 011 65-487-2825
Japan Office
Lutron Asuka Co., Ltd.
No. 16 Kowa Bldg. 4F
1-9-20 Akasaka,
Minato-ku, Tokyo 107-0052, Japan
TOLL FREE: (0120) 083417 (Japan)
Tel: 011 81-3-5575-8411
Fax: 011 81-3-5575-8411
Worldwide Technical and Sales
Assistance
If you need technical assistance, call the toll-free
Lutron Technical Assistance Hotline. Please
provide exact model number when calling.
(800) 523-9466 (U.S.A., Canada and the Caribbean)
Other countries call:
Tel: (610) 282-3800; International: 1 610 282-3800
Fax: (610) 282-3090; International: 1 610 282-1243
Our address on the Web is www.lutron.com
Lutron and GRAFIK Eye are registered trademarks of Lutron Electronics Co., Inc.
National Electrical Code, NEC, and NFPA are registered trademarks of the National
Fire Protection Association, Inc. Quincy, MA.
APPLICATION NOTE
W17
P/N 048-060 rev. A
7/03